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Inventories
12 Months Ended
Dec. 31, 2017
Inventory Disclosure [Abstract]  
Inventories
Inventories

The components of inventories consisted of the following (in thousands):
December 31,
 
2017
 
2016
New vehicles
 
$
1,553,751

 
$
1,338,110

Used vehicles
 
500,011

 
368,067

Parts and accessories
 
78,982

 
66,410

   Total inventories
 
$
2,132,744

 
$
1,772,587



The new vehicle inventory cost is generally reduced by manufacturer holdbacks and incentives, while the related floor plan notes payable are reflective of the gross cost of the vehicle. As of December 31, 2017 and 2016, the carrying value of inventory had been reduced by $19.8 million and $18.1 million, respectively, for assistance received from manufacturers as discussed in Note 1.